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Analog Devices Inc. LTC3220IPF#PBF
- Part No.:
- LTC3220IPF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
LTC3220IPF#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 20MA 28UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:602
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Product details
Overview
LTC3220IPF#PBF from Analog Devices (formerly Linear Technology) is a 18-channel universal LED driver IC with integrated multi-mode charge pump, I²C-controlled 6-bit linear DACs, and independent brightness/blink/gradation per channel. It delivers up to 20mA per channel (360mA total), operates from 2.9V–5.5V VIN, supports –40°C to 125°C industrial temperature range, and targets high-density display backlighting in compact portable devices.
For engineers reviewing the LTC3220IPF#PBF datasheet, LTC3220IPF#PBF pinout, LTC3220IPF#PBF application, or LTC3220IPF#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specs, and real-world selection guidance for multi-LED lighting control in space-constrained designs.
Technical Context
The LTC3220IPF#PBF integrates an adaptive switched-capacitor charge pump with automatic 1x → 1.5x → 2x mode switching triggered by LED current source dropout detection. Its 18 universal current sources each feature 64-step linear DAC control, independent blink/gradation timing (0.156–2.5s), and dual-mode operation (current source or open-drain GPO).
Operation relies on a fixed 850kHz oscillator, slew-limited flying capacitor switching (C1P/C1M/C2P/C2M), and I²C slave interface with two factory-set addresses (0011100 for LTC3220, 0011101 for LTC3220-1). Internal soft-start limits inrush current during mode transitions, and thermal shutdown protects against sustained overloads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 5.5V - Supports single-cell Li-ion, Li-poly, or 3.3V/5V rail without external LDO. |
| Total Output Current | Up to 360mA - Enables full drive of 18×20mA LEDs or mixed configurations (e.g., 6 main + 4 RGB). |
| LED Current Accuracy | ±1.5% matching between any two outputs at 50% full scale - Ensures uniform brightness across multi-LED arrays. |
| Charge Pump Efficiency | Up to 91% - Minimizes power loss and thermal load in battery-powered handhelds. |
| Operating Temperature | –40°C to +125°C - Qualified for automotive cabin, industrial HMI, and extended-temperature embedded displays. |
| I²C Interface Speed | Up to 400kHz - Compatible with standard Fast-mode microcontrollers without custom timing adjustments. |
| Package | 28-lead 4mm × 4mm UTQFN (0.55mm height) - Enables ultra-thin bezel integration in smartphones and wearables. |
Pinout & Package
28-lead ultrathin QFN (UTQFN), 4mm × 4mm, 0.55mm profile, exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ULED1–ULED18 (Pins 1–9, 13–21) | Universal current source outputs | Each programmable 0–20mA sink with 6-bit DAC; configurable as open-drain GPO with strong pull-down or current-limited mode. |
| VIN (Pin 24) | Main power input | Bypassed with 2.2µF ceramic capacitor; powers charge pump and internal logic; UVLO threshold = 1.5V. |
| DVCC (Pin 10) | Digital I/O supply | Sets logic reference for SCL/SDA/RST; UVLO threshold = 1V; requires 0.1µF ceramic decoupling to GND. |
| SCL / SDA (Pins 11 / 12) | I²C serial interface | Standard 2-wire slave interface; supports 400kHz Fast-mode; logic levels referenced to DVCC. |
| RST (Pin 25) | Active-low reset | Asynchronously clears all registers and forces shutdown; must be pulled high for normal operation. |
| CPO (Pin 28) | Charge pump output | Regulated output (up to 5.1V) powering all ULED channels; requires 4.7µF ceramic capacitor to GND. |
| C1P/C1M/C2P/C2M (Pins 27/23/26/22) | Flying capacitor connections | Support 2.2µF ceramic caps for 1.5x/2x charge pump operation; slew-limited to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching charge pump modes | 1x → 1.5x → 2x transition based on real-time dropout detection - eliminates manual voltage rail selection and reduces BOM count. |
| Independent per-channel control | Full on/off, 64-step brightness, blink (1.25/2.5s period), and gradation (0.24/0.48/0.96s ramp) via I²C - enables dynamic UI effects without host CPU overhead. |
| Low-noise operation | Slew-limited flying capacitor switching and 850kHz fixed-frequency clock - meets Class B EMI requirements in portable audio/video devices. |
| GPO reconfigurability | Any ULED pin switchable to open-drain general-purpose output with selectable strong-pull-down (3µA IQ) or current-limited (≤20mA) mode - increases system flexibility without adding discrete FETs. |
| Robust protection | Short-circuit detection on CPO, thermal shutdown, and absolute max ratings covering –0.3V to 6V on all pins - ensures reliability in noisy or miswired environments. |
Applications
| Smartphone Keypad Backlighting | QVGA+ Display Backlight |
|---|---|
|
Use Scenario: Illuminating alphanumeric keypads in low-light conditions with dynamic intensity scaling and fade effects. IC Role / Device Role / Timing Role: Universal current source driver with independent per-key brightness and gradation control via I²C. Use Value: Enables smooth UI transitions using built-in 0.24–0.96s ramp times and eliminates need for external PWM generators or MCU GPIO expansion. |
Use Scenario: Powering segmented or full-array LED backlights in QVGA+ resolution displays for video phones and PDAs. IC Role / Device Role / Timing Role: High-efficiency charge pump LED driver delivering up to 360mA total with automatic voltage mode adaptation. Use Value: Maintains consistent brightness across varying input voltage (2.9–5.5V) and LED forward voltage drift, reducing firmware compensation complexity. |
| RGB Indicator Lighting | Industrial HMI Panel Lighting |
|
Use Scenario: Driving 4-channel RGB LEDs for status indication with synchronized color blending and blinking patterns. IC Role / Device Role / Timing Role: Independent 6-bit DAC control per channel plus coordinated blink/gradation timing via shared REG19 register. Use Value: Achieves precise color mixing and attention-grabbing visual alerts using hardware-timed sequences-no host processor intervention required. |
Use Scenario: Providing reliable, long-life illumination for buttons, icons, and status indicators in factory-floor HMIs operating at 125°C ambient. IC Role / Device Role / Timing Role: Industrial-grade LED driver with –40°C to +125°C qualification and thermal shutdown protection. Use Value: Guarantees uninterrupted operation in harsh thermal environments where consumer-grade drivers would derate or fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3728-QFLS4-TR | 28-channel, I²C, 40mA/channel, but uses external VDD/VCC bias and lacks auto-boost charge pump. | Requires separate 5V rail for LED supply; better suited for fixed-voltage systems with higher per-channel current needs. | Select IS31FL3728 when >20mA/channel or >18 channels are required, and external boost is acceptable. |
| MAX20050ATG+T | 4-channel, 150mA/channel, integrated buck-boost controller, AEC-Q100 qualified, but no per-channel DAC or gradation. | Targeted at automotive exterior lighting; lacks fine-grained dimming and UI animation features. | Select MAX20050 for high-current, safety-critical automotive lighting where I²C animation features are unnecessary. |
Compared with IS31FL3728-QFLS4-TR and MAX20050ATG+T, the LTC3220IPF#PBF uniquely combines 18-channel 20mA sourcing, integrated adaptive charge pump, and hardware-accelerated gradation/blinking-making it optimal for compact, battery-powered UI lighting where efficiency, size, and visual sophistication are jointly critical.
Availability
LTC3220IPF#PBF is available at Aetrix Electronics and suitable for smartphone keypad backlighting, QVGA+ display backlighting, and industrial HMI panel lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3220IPF#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3220IPF#PBF belongs to Linear's precision LED driver product line, designed specifically for space-constrained, multi-LED UI applications demanding high integration, low EMI, and rich visual control without MCU resource burden.
FAQ
What is the maximum junction temperature and thermal resistance of the LTC3220IPF#PBF?
The LTC3220IPF#PBF has a maximum junction temperature (TJMAX) of 125°C and a thermal resistance θJA of 37°C/W. Its 28-lead UTQFN package with exposed pad must be soldered to PCB ground for effective heat dissipation. The device includes thermal shutdown that activates above TJMAX to protect against sustained overload conditions.
Does the LTC3220IPF#PBF support both 1.8V and 3.3V I²C logic levels?
No - the LTC3220IPF#PBF references all digital I/O (SCL, SDA, RST) to DVCC, not VIN. DVCC must be supplied within 1.5V–5.5V, and logic thresholds are defined as VIL = 0.3×DVCC and VIH = 0.7×DVCC. To interface with 1.8V microcontrollers, DVCC must be set to 1.8V; for 3.3V systems, DVCC = 3.3V.
How does the LTC3220IPF#PBF handle LED dropout, and can it be disabled?
The LTC3220IPF#PBF detects dropout when a ULED pin voltage falls below the level needed to sustain programmed current, triggering automatic 1x → 1.5x → 2x charge pump mode switching. Dropout detection is disabled when any ULED is configured in GPO mode (Bit 6 & 7 = 1 in its data register), preventing unintended mode changes during open-drain operation.
Can the LTC3220IPF#PBF drive LEDs with forward voltages exceeding 5.1V?
No - the LTC3220IPF#PBF's charge pump regulates CPO to a maximum of 5.1V in 2x mode. Driving LEDs with VF > 5.1V would cause continuous dropout and prevent stable regulation. For higher-VF LEDs, external boost or buck-boost solutions are required; the LTC3220IPF#PBF is optimized for typical white/RGB LEDs with VF ≤ 4.2V at 20mA.
What is the function of the exposed pad (Pin 29) on the LTC3220IPF#PBF?
The exposed pad (Pin 29) on the LTC3220IPF#PBF is electrically connected to GND and serves dual purposes: thermal conduction to the PCB for heat dissipation, and low-inductance grounding for noise-sensitive charge pump operation. Per datasheet requirements, it must be soldered to a solid GND plane using appropriate thermal vias - floating or unconnected pads will compromise thermal performance and EMI behavior.
LTC3220IPF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-UFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- -
- Number of Outputs:
- 18
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- 850kMz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-UTQFN (4x4)
LTC3220IPF#PBF FAQ
1.How can I place an order for LTC3220IPF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3220IPF#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3220IPF#PBF reliable?
The price and inventory of LTC3220IPF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3220IPF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3220IPF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3220IPF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3220IPF#PBF?
LTC3220IPF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3220IPF#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3220IPF#PBF?
For technical support, including LTC3220IPF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3220IPF#PBF requirements.
6.How does Aetrix verify that LTC3220IPF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3220IPF#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3220IPF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3220IPF#PBF?
All LTC3220IPF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3220IPF#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3220IPF#PBF part is unused and in its original packaging.
Return procedure for LTC3220IPF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3220IPF#PBF Tags
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